U-Pb Zircon Dating of Ash Fall Deposits from the Paleozoic Paraná Basin of Brazil and Uruguay: a Reevaluation of the Stratigraphic Correlations
U-Pb Zircon Dating of Ash Fall Deposits from the Paleozoic Paraná Basin of Brazil and Uruguay: A Reevaluation of the Stratigraphic Correlations A. C. Rocha-Campos,1 M. A. S. Basei,1 A. P. Nutman,2 P. R. Santos,1 C. R. Passarelli,1,* F. M. Canile,1 O. C. R. Rosa,1 M. T. Fernandes,1 H. Santa Ana,3 and G. Veroslavsky4 1. Instituto de Geociências, Universidade de São Paulo, São Paulo, Brazil; 2. GeoQuEST Research Centre, School of Earth and Environmental Sciences, University of Wollongong, Wollongong, New South Wales, 2522, Australia; Research School of Earth Sciences, Australian National University, Canberra, Australian Capital Territory, 2000, Australia; and Institute of Geology, Chinese Academy of Geological Sciences, 26 Baiwanzhuang Road, Beijing 100037, China; 3. Administración Nacional de Combustibles, Alcohol y Petróleo, Montevideo, Uruguay; 4. Facultad de Ciencias, Universidad de la República, Montevideo, Uruguay ABSTRACT Ash fall layers and vitroclastic-carrying sediments distributed throughout the entire Permian stratigraphic range of the Paraná Basin (Brazil and Uruguay) occur in the Tubarão Supergroup (Rio Bonito Formation) and the Passa Dois Group (Irati, Estrada Nova/Teresina, Corumbataí, and Rio do Rasto Formations), which constitute the Gondwana 1 Super- sequence. U-Pb zircon ages, acquired by SHRIMP and isotope-dissolution thermal ionization mass spectrometer (ID- TIMS) from tuffs within the Mangrullo and Yaguari Formations of Uruguay, are compatible with a correlation with the Irati and parts of the Teresina and Rio do Rasto
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